Change in coreboot[master]: soc/amd/{cezanne,picasso,stoney}: Clear PM/GPE when enabling ACPI

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/59928 )

Change subject: soc/amd/{cezanne,picasso,stoney}: Clear PM/GPE when enabling ACPI
......................................................................

soc/amd/{cezanne,picasso,stoney}: Clear PM/GPE when enabling ACPI

According to https://uefi.org/specs/ACPI/6.4/16_Waking_and_Sleeping/sleeping-states.html?...
> For ACPI/legacy systems, when transitioning from the legacy to the G0
> working state this register is cleared by platform firmware prior to
> setting the SCI_EN bit.

This change makes sure we clear the PM/GPE blocks are cleared before
enabling the SCI_EN bit.

BUG=b:172021431
TEST=Boot guybrush and morphius to OS and verify suspend resume still
works.

Signed-off-by: Raul E Rangel 
Change-Id: Icc6f542185dc520f8d181423961b74481c0b5506
---
M src/soc/amd/cezanne/smihandler.c
M src/soc/amd/picasso/smihandler.c
M src/soc/amd/stoneyridge/smihandler.c
3 files changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/28/59928/1

diff --git a/src/soc/amd/cezanne/smihandler.c b/src/soc/amd/cezanne/smihandler.c
index 7653836..2549ef8 100644
--- a/src/soc/amd/cezanne/smihandler.c
+++ b/src/soc/amd/cezanne/smihandler.c
@@ -23,6 +23,7 @@

switch (cmd) {
    case APM_CNT_ACPI_ENABLE:
+		acpi_clear_pm_gpe_status();
    	acpi_enable_sci();
    	break;
    case APM_CNT_ACPI_DISABLE:
diff --git a/src/soc/amd/picasso/smihandler.c b/src/soc/amd/picasso/smihandler.c
index b13c6e0..f9f5fc0 100644
--- a/src/soc/amd/picasso/smihandler.c
+++ b/src/soc/amd/picasso/smihandler.c
@@ -23,6 +23,7 @@

switch (cmd) {
    case APM_CNT_ACPI_ENABLE:
+		acpi_clear_pm_gpe_status();
    	acpi_enable_sci();
    	break;
    case APM_CNT_ACPI_DISABLE:
diff --git a/src/soc/amd/stoneyridge/smihandler.c b/src/soc/amd/stoneyridge/smihandler.c
index f9c4a54..50a5111 100644
--- a/src/soc/amd/stoneyridge/smihandler.c
+++ b/src/soc/amd/stoneyridge/smihandler.c
@@ -21,6 +21,7 @@

switch (cmd) {
    case APM_CNT_ACPI_ENABLE:
+		acpi_clear_pm_gpe_status();
    	acpi_enable_sci();
    	break;
    case APM_CNT_ACPI_DISABLE: